Over the past 36 months, our analysts have monitored the Koh Samui residential market and documented projects that failed to deliver on schedule. Based on our estimates, as of end-2025 at least 14 active developments on the island carried delays exceeding six months against their original timelines. For any buyer committing funds at the pre-construction stage, verifying a developer is not a procedural formality - it is the single most consequential step in the entire purchase process.
Several dozen development companies operate on Koh Samui, ranging widely in scale and track record. A significant share are single-purpose vehicles (SPVs) created for one project only. Others have five, ten, or more completed buildings behind them. The difference in risk profile between these two groups is fundamental and quantifiable. Below we set out the step-by-step framework our research desk applies in practice.
Quick answer
- We examine developer track record: number of completed projects, average delay in months, and construction quality verified on the ground
- We analyse construction financing structure: whether the developer holds a bank construction loan or relies exclusively on buyer deposits to fund the build
- We verify permit completeness: building permit (Ror. 1), Environmental Impact Assessment (EIA) for projects exceeding 80 units or located in a coastal protection zone, and Chanote title on the land
- We review payment schedules for proportionality to construction progress - our warning threshold is more than 50% of the purchase price required before foundation completion
- Thailand has no buyer-deposit protection mechanism equivalent to European escrow systems; the realistic protections are contractual penalty clauses, milestone-linked payment tranches, and the developer's balance sheet
- We conduct on-site visits to the active construction site and to previous projects by the same developer to assess build quality first-hand
Options and scenarios
Scenario A - developer with a documented portfolio of five or more completed projects
In our assessments, we classify as relatively lower risk those developers who have delivered at least five projects on Koh Samui or Phuket within the past ten years, with an average delay not exceeding three months. Developers at this level typically carry a credit facility with a Thai bank - Bangkok Bank and Kasikornbank are the institutions we most frequently see in this role - which means they have already passed a bank-level due-diligence process. That bank review covers both the developer's solvency and the legal title to the land before financing is extended, which is a meaningful signal for any prospective buyer.
In this scenario, payment schedules are generally structured across five to seven tranches: an opening payment of 20-30% at contract signing, with subsequent tranches tied to defined milestones - foundations, structural frame, roof, fit-out, and handover.
Scenario B - developer with one to four completed projects
This is the most common profile we encounter on Koh Samui, and we monitor these developers with heightened attention. The key questions our analysts pursue: Were previous projects delivered free of material structural defects? Does the Thai company (Co., Ltd.) show positive shareholders' equity in its most recent annual financial statement, available via the Department of Business Development (as of 2026)? Is the land for the new project free of mortgage encumbrances?
Warning thresholds we apply in this scenario: any prior project delayed by more than six months, no disclosed bank financing, or a requirement to pay more than 40% of the purchase price before construction begins.
Scenario C - first-project developer or single-purpose SPV
This represents the highest risk tier we document on Koh Samui. An SPV created specifically for one development has no verifiable history. In our analyses for this profile, we place particular emphasis on three factors: the professional background of the individuals behind the project and their construction-industry experience, the track record of the appointed main contractor (how many buildings has the contractor completed independently), and the existence of a completion guarantee issued by a third party - a bank, insurance company, or parent entity.
In this scenario, an acceptable payment structure is one in which no more than 30% of the purchase price is payable before the shell-and-core stage is reached, and the contract includes delay penalties of at least 0.01 to 0.05% of the contract value per day.
Comparison table
| Parameter | Developer: 5 or more projects | Developer: 1 to 4 projects | SPV / first project |
|---|---|---|---|
| Typical delay risk | Low (0-3 months) | Moderate (3-6 months) | High (6-18 months) |
| Bank construction financing | Usually in place | Sometimes | Rarely |
| Typical opening payment | 20-30% | 30-40% | 30-50% |
| Financial statements available | Yes (DBD registry) | Yes (DBD registry) | Limited (new entity) |
| Contractual delay penalties | Standard (0.01%/day) | Negotiable | Often absent or token |
| On-site quality verification | Possible via prior projects | Partially possible | Not possible (no history) |
| Recommended additional protection | Standard contract terms | Independent snagging inspection | Third-party completion guarantee |
Risks and mistakes
Assuming buyer deposits are protected the way they are in Europe
Several European jurisdictions require developers to hold buyer funds in ring-fenced accounts. Thailand has no equivalent mechanism for foreign property buyers. Payments go directly into the developer's operating account. The realistic protections available are a well-drafted purchase agreement - one that includes the right to rescind and recover all paid amounts if the project is delayed beyond a defined threshold (commonly 180 days) - and the demonstrated financial solidity of the developer's company.
Relying exclusively on marketing materials
Our analysts visit active construction sites and compare actual progress against the developer's stated timeline. We have repeatedly documented cases where 3D renders and sales brochures described specifications that diverged materially from what was built. In the Bophut and Maenam districts of Koh Samui in particular, we have reviewed projects marketed as high-specification that used economy-grade finishing materials on site.
Incomplete or missing permits
The building permit (Ror. 1), issued by the local Tessabaan or sub-district administration (OrBorTor), is a necessary but insufficient starting point. For coastal developments on Koh Samui - specifically within 50 metres of the shoreline - an additional environmental permit is required. We also verify that the developer holds a Chanote (full freehold title) on the land rather than a Nor Sor 3 Gor certificate, which carries weaker legal protections.
Accepting an aggressive front-loaded payment schedule
Our internal warning threshold: if a developer requires more than 50% of the purchase price before the shell-and-core stage is complete, we treat that as evidence the project is being funded primarily from buyer deposits. These projects are most exposed to a cascade effect - when sales slow, construction stalls.
Skipping verification of the main contractor
On Koh Samui, the developer and the main contractor are frequently two separate legal entities. We review the contract between them, confirm the contractor holds a valid construction licence, and check whether adequate site insurance is in place. During 2025, our monitoring recorded cases where a main contractor abandoned a site mid-build due to a financial dispute with the developer.
FAQ
How do we verify a developer's history on Koh Samui before committing funds?
Our starting point is the Department of Business Development (DBD) registry in Bangkok, which holds financial statements for all registered Thai companies. We check the registration date, paid-up capital, shareholder structure, and three years of financial results. We then visit the developer's previous projects on the ground to assess construction quality, actual delivery dates against promised ones, and the condition of common areas after several years of use.
Are there escrow or trust accounts for foreign buyers on Koh Samui?
No. Thailand does not operate a buyer-deposit protection system equivalent to European trust or escrow arrangements for foreign real estate purchases. The protections that do exist are contractual: milestone-linked payment schedules, penalty clauses for delay written into the purchase agreement, and the right to withdraw and recover funds after a defined delay period has been exceeded.
How many completed projects should a developer have before we consider the risk acceptable?
In our risk framework, five completed projects delivered within ten years is the threshold we use to define the lower-risk band. A developer with two or three completions is not automatically disqualified, but the analysis must go deeper - covering financial statements, contractor quality, and stronger contractual protections.
What permits should a Koh Samui developer hold in 2026?
The minimum set we verify: Chanote (full freehold land title), building permit Ror. 1 issued by the relevant local authority, and - for projects above 80 units or within a designated coastal protection zone - a completed EIA (Environmental Impact Assessment). As of 2026 we also check alignment with the Koh Samui City Plan (local zoning ordinance), which has become a more active enforcement area.
What does a secure payment schedule look like for an off-plan purchase?
A well-structured schedule links each tranche to a verifiable construction milestone. The model our analysts consider reasonable: 20-30% at contract signing, 10-15% at foundation completion, 10-15% at structural frame, 10-15% at roof and shell closure, 10-15% at fit-out completion, and the balance at handover. Total payments before key handover should not exceed 90% of the purchase price.
What recourse is available if a Koh Samui developer delays delivery?
Recourse depends almost entirely on what is written in the purchase agreement before signing. A properly drafted contract should specify penalty payments of 0.01 to 0.05% of the contract value per day of delay, plus the buyer's unconditional right to rescind and recover all paid amounts if delay exceeds 180 days. Our analysts recommend negotiating these clauses before signature, not pursuing them after a problem has emerged.
Is it useful to vet a Koh Samui developer who is also active on Phuket?
Yes, and we consider it an advantage. Developers operating concurrently on Phuket - for example in Bang Tao, Layan, or Kamala - give our analysts a larger data set to work with. We can cross-reference delivery timelines, construction quality, and post-handover service across different projects and geographies. In our assessments, developers with consistent records across both markets score higher on transparency, provided the data from both locations aligns.
How can an overseas buyer access a Thai developer's financial statements?
Annual financial reports filed by Thai companies are publicly accessible through the DBD data warehouse (datawarehouse.dbd.go.th). The retrieval fee is a nominal amount in Thai baht. The metrics our analysts prioritise: positive shareholders' equity, a debt-to-equity ratio below 3:1 for property developers, and positive operating cash flow over the most recent reporting period.
What does an independent building inspection cost on Koh Samui in 2026?
Based on our current market estimates, a snagging inspection for a single villa on Koh Samui in 2026 costs between 15,000 and 35,000 THB (approximately USD 420 to USD 980 at Q1 2026 exchange rates). The inspection covers structural elements, electrical systems, plumbing, and interior finishes. We recommend commissioning one before making the final payment tranche.
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